[GRASS5] r.contour crashes if step=0.5

[Markus Neteler]

Hi developers,

r.contour crashes if step=0.5... Floating point exception.
I actually cannot see the problem. The offending line is a macro:

  dmax = (max->answer) ? atof (max->answer) : zmax - (int)zmax%(int)dstep;

dstep contains 0.5, zmax is determined my the program zmax=7.1231 here).

Thanks in advance

 Markus

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